Update CHANGELOG with 8.12.2 and 8.12.3 changes.

CHANGELOG

@@ -21,8 +21,12 @@ v 8.13.0 (unreleased)
   - API: expose pipeline data in builds API (!6502, Guilherme Salazar)
   - Fix broken repository 500 errors in project list
 
-v 8.12.2 (unreleased)
-  - Added University content to doc/university
+v 8.12.4 (unreleased)
+
+v 8.12.3
+  - Update Gitlab Shell to support low IO priority for storage moves
+
+v 8.12.2
   - Fix Import/Export not recognising correctly the imported services.
   - Fix snippets pagination
   - Fix List-Unsubscribe header in emails
@@ -31,11 +35,14 @@ v 8.12.2 (unreleased)
   - Fix errors importing project feature and milestone models using GitLab project import
   - Make JWT messages Docker-compatible
   - Fix duplicate branch entry in the merge request version compare dropdown
+  - Respect the fork_project permission when forking projects
+  - Only update issuable labels if they have been changed
+  - Fix bug where 'Search results' repeated many times when a search in the emoji search form is cleared (Xavier Bick) (@zeiv)
+  - Fix resolve discussion buttons endpoint path
 
 v 8.12.1
   - Fix a memory leak in HTML::Pipeline::SanitizationFilter::WHITELIST
   - Fix issue with search filter labels not displaying
-  - Fix bug where 'Search results' repeated many times when a search in the emoji search form is cleared (Xavier Bick) (@zeiv)
 
 v 8.12.0
   - Update the rouge gem to 2.0.6, which adds highlighting support for JSX, Prometheus, and others. !6251
@@ -52,7 +59,6 @@ v 8.12.0
   - Filter tags by name !6121
   - Update gitlab shell secret file also when it is empty. !3774 (glensc)
   - Give project selection dropdowns responsive width, make non-wrapping.
-  - Fix resolve discussion buttons endpoint path
   - Fix note form hint showing slash commands supported for commits.
   - Make push events have equal vertical spacing.
   - API: Ensure invitees are not returned in Members API.